Pressure regulating valve

ABSTRACT

The present invention discloses a pressure regulating valve, which comprises an actuator and a valve body, wherein communicating passages are arranged between a chamber of the valve body and a chamber of the actuator, a pressure tapping pipe is further arranged in the chamber of the valve body, one end of the pressure tapping pipe is connected with the communicating passage and the other end of the pressure tapping pipe is suspended. By adopting the embodiment of the pressure tapping structure in the pressure regulating valve provided by the present invention, the performance of the pressure regulating valve in a flow accuracy range is improved.

FIELD OF THE INVENTION

The present invention belongs to the field of fluid control and specifically relates to a pressure regulating valve, in particular to an internal pressure tapping type pressure regulating valve.

BACKGROUND OF THE INVENTION

In the design of an internal pressure tapping type pressure regulator, since downstream pressure needs to be directly tapped in the pressure regulator, a pressure tapping passage communicated with a valve body and the downstream of an actuator is usually designed in the pressure regulator. FIG. 1 is a schematic diagram of a pressure regulating valve with a straight-through type internal pressure tapping structure and FIG. 2 shows the straight-through type internal pressure tapping structure as shown in FIG. 1. In FIG. 1 and FIG. 2, an internal pressure tapping passage is a passage through which downstream gas enters a lower chamber of the actuator to obtain downstream pressure. A curve 1 in FIG. 7 represents a performance curve chart under a straight-through type internal pressure tapping manner as shown in FIG. 1. From the curve 1, it can be seen that the performance of the pressure regulator in a flow accuracy range is very poor and pressure drop is too fast.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problem, the present invention provides an embodiment of a pressure regulating valve. By adopting the design of the internal pressure tapping structure of the pressure regulating valve, the performance of the pressure regulator in a flow accuracy range is improved.

The pressure regulating valve provided by the embodiment of the present invention comprises:

an actuator and a valve body,

wherein communicating passages are arranged between a chamber of the valve body and the chamber of the actuator,

a pressure tapping pipe is further arranged in the chamber of the valve body, one end of the pressure tapping pipe is connected with the communicating passage and the other end of the pressure tapping pipe is suspended.

The number of the communicating passages is at least two, and the pressure tapping pipe is connected with at least one of the communicating passages.

The suspended end of the pressure tapping pipe is arranged in a direction along a gas or fluid flow direction.

The chamber of the valve body comprises a pressure inlet chamber and a pressure outlet chamber, and the pressure tapping pipe is arranged in the pressure outlet chamber.

The above-mentioned pressure regulating valve comprises:

a valve rod and a valve seat, wherein the actuator is capable of pushing the valve seat to move in the pressure inlet chamber or the pressure outlet chamber through one end of the valve rod; and

a guide device sleeved on the valve rod, wherein the guide device is arranged between the valve body and the actuator, and the communicating passages can be arranged on the guide device.

The communicating passages are distributed on two symmetrical sides of an axis of the valve rod.

The guide device can be integrally molded with the actuator.

The communicating passages are cylindrical holes.

In the embodiment provided by the present invention, by arranging the passage communicated with the chamber of the valve body and the chamber of the actuator and the pressure tapping pipe to sense the downstream pressure of the valve body, the problem that the pressure drop of the pressure regulator in the flow accuracy range is too fast is improved.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a pressure regulating valve with a straight-through type internal pressure tapping structure in the related arts;

FIG. 2 shows the straight-through type internal pressure tapping structure in FIG. 1;

FIG. 3 is a schematic diagram of a pressure regulating valve with an internal pressure tapping structure having a pressure tapping pipe provided by the embodiment of the present invention;

FIG. 4 shows the single-hole internal pressure tapping structure having the pressure tapping pipe in FIG. 3;

FIG. 5 is a schematic diagram of a pressure regulating valve with a dual-hole internal pressure tapping structure having a pressure tapping pipe provided by the embodiment of the present invention;

FIG. 6 shows the dual-hole internal pressure tapping structure having the pressure tapping pipe in FIG. 5;

FIG. 7 is a performance curve chart under three pressure tapping manners as shown in FIG. 1, FIG. 3 and FIG. 5;

FIG. 8 is a schematic diagram of another pressure regulating valve with a dual-hole internal pressure tapping structure having a pressure tapping pipe provided by the embodiment of the present invention.

Description of numeral references: 11-guide device, 12-passage, 13-pressure tapping pipe, 2-valve body, 21-pressure inlet, 22-pressure outlet, 23-valve chamber, 231-pressure inlet chamber, 232-pressure outlet chamber, 233-valve port, 3-actuator, 311-first diaphragm cap, 312-second diaphragm cap, 321-diaphragm, 322-first diaphragm plate, 323-second diaphragm plate, 331-spring, 332-regulating rod, 34-lever, 4-valve seat, 5-valve rod.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solution of the present invention will be further described below in combination with the drawings and the detailed description of the embodiments.

FIG. 3 is a schematic diagram of a pressure regulating valve with an internal pressure tapping structure having a pressure tapping pipe. The pressure regulating valve comprises a valve body 2, an actuator 3, a valve seat 4, a valve rod 5, a guide device 11 and a pressure tapping pipe 13. The valve body 2 comprises a pressure inlet 21, a pressure outlet 22 and a valve chamber 23. The actuator 3 is fixedly connected with the valve body 2. The valve seat 4 is movably arranged in the valve chamber 23. The valve rod 5 comprises a first end and a second end, the first end of the valve rod is placed in the actuator 3, the second end of the valve rod is fixed in the valve seat 4, and the valve rod 5 and the valve seat 4 can jointly move along an axis direction of the valve rod. The guide device 11 is fixed on the actuator 3 or the valve body 2. When the valve rod 5 moves, the guide device 11 guides the valve rod 5.

As shown in FIG. 3 and FIG. 4, the internal pressure tapping structure of the pressure regulating valve comprises a passage 12 communicated with the actuator 3 and the valve chamber 23 and the pressure tapping pipe 13, and the passage 12 is arranged on the guide device 11; and one end of the pressure tapping pipe is communicated with the valve chamber 23 and the other end of the pressure tapping pipe is communicated with the passage 12.

The valve chamber 23 comprises a pressure inlet chamber 231 communicated with the pressure inlet 21, a pressure outlet chamber 232 communicated with the pressure outlet 22, and a valve port 233 communicated with the pressure inlet chamber 231 and the pressure outlet chamber 232.

Since the pressure is the outlet pressure of the pressure regulating valve, the pressure tapping pipe 13 is preferably placed in the pressure outlet chamber 232 (because the pressure outlet chamber is located on the pressure outlet side) and the pressure tapping effect obtained is better.

The inlet pressure of the pressure regulating valve provided by the present disclosure can be gas pressure and can also be liquid pressure. Accordingly, the outlet pressure can be gas pressure and can also be liquid pressure. If the pressure tapping pipe is arranged along a gas or fluid flow direction, the obtained pressure tapping effect will be better.

A curve 2 in FIG. 7 represents a performance curve under a pressure tapping manner as shown in FIG. 3, i.e., a performance curve chart under a single-hole internal pressure tapping manner with a pressure tapping pipe. From FIG. 7, it can be seen that the performance of the pressure regulating valve in the flow accuracy range is not good and the pressure rise is too big.

Further, on the basis of FIG. 4, the inventor makes an improvement to form another pressure tapping passage on the other side of the valve rod opposite to the pressure tapping passage corresponding to the pressure tapping pipe, as shown in FIG. 6, so as to enable the two passages to tap pressure simultaneously and finally enable the pressure regulator to have better performance in the flow accuracy range.

Specifically, the internal pressure tapping structure of the pressure regulating valve comprises two passages 12 which are arranged on the guide device 11 and are communicated with the actuator 3 and the valve chamber 23, wherein one passage 12 is communicated with the pressure tapping pipe 13. Preferably, the two passages are respectively distributed on two sides of an axis of the valve rod, wherein the obtained pressure tapping effect is better in case of symmetrical distribution.

The pressure regulating valve adopting a dual-hole pressure tapping manner is as shown in FIG. 5. A curve 3 in FIG. 7 represents a performance curve under a pressure tapping manner as shown in FIG. 5, i.e., a performance curve chart under a dual-hole internal pressure tapping manner with a pressure tapping pipe. From FIG. 7, it can be seen that, compared with the curve 1 and the curve 2, the curve 3 indicates that the performance of the pressure regulating valve in the flow accuracy range is greatly improved.

It is to be noted that the position of the pressure tapping passage is not fixed in the design process and can be adjusted according to the requirements. In addition, the size and the number of the pressure tapping passages can also be adjusted according to different performance. In other words, the number of the pressure tapping passages can be more than two and the pressure tapping pipe can be communicated with only one passage thereof.

In the design process, the vertical distance from the valve port to the pressure tapping passage can be adjusted, so as to obtain performance which better satisfies the requirement. By taking FIG. 6 as an example, D refers to the vertical distance from the valve port 233 to the pressure tapping passage 12 and the value of D can be adjusted according to the needed performance in the design process of the valve.

The above-mentioned guide device 11 can also be integrally molded with the actuator 3.

The valve seat 4 connected with the valve rod 5 can be a rubber pad.

The above-mentioned description content is detailed description of the pressure regulating valve, as show in FIG. 3, to which the internal pressure tapping structure of the present disclosure is applied. Description is made below to other parts of the pressure regulating valve. As shown in FIG. 3, the actuator comprises a diaphragm cap assembly, a diaphragm assembly, a pressure regulating device and a lever. Wherein, the diaphragm cap assembly comprises a first diaphragm cap 311 and a second diaphragm cap 312, the first diaphragm cap 311 is connected with the pressure regulating device, the second diaphragm cap 312 is connected with the valve body 2, and the first diaphragm cap 311 and the second diaphragm cap 312 are matched with each other to form a hollow internal portion. The diaphragm assembly comprises a diaphragm 321, a first diaphragm plate 322 and a second diaphragm plate 323, the diaphragm 321 is pressed between the first diaphragm plate 322 and the second diaphragm plate 323, the diaphragm 321 is located between the first diaphragm cap 311 and the second diaphragm cap 312, the first diaphragm plate 322 is located within a cavity formed between the diaphragm 321 and the first diaphragm cap 311, and the second diaphragm plate 323 is located within a cavity formed between the diaphragm 321 and the second diaphragm cap 312. The pressure regulating device comprises a spring 331 and a regulating rod 332, the spring 331 is located inside of the first diaphragm cap 311, the regulating rod 332 comprises a third end and a fourth end, the third end of the regulating rod penetrates through the first diaphragm cap 311 and is in contact with the spring 331, the fourth end of the regulating rod is suspended and the regulating rod is fixed on the first diaphragm cap 311. The lever 34 as shown in FIG. 3 comprises three connecting ends, i.e., a fifth end, a sixth end and a seventh end, wherein the fifth end of the lever is movably connected with the diaphragm assembly, the sixth end of the lever is movably connected with the first end of the valve rod 5 and the seventh end of the lever is movably connected with the second diaphragm cap 312.

It is to be noted that the lever in FIG. 3 can also be other linked parts or a structure without a lever.

The working principle of the pressure regulating valve as shown in FIG. 3 is that gas or liquid enters into the valve along the pressure inlet chamber from the pressure inlet, and a user can set the needed outlet pressure by adjusting the spring force through the regulating rod as desired. Under the effect of the spring force and the downstream pressure of the valve body (the downstream pressure of the valve body is changing), the diaphragm moves leftwards and rightwards to drive the lever to rotate, such that the valve rod is driven to move vertically and the size of the opening of the valve seat is changed to change the downstream pressure till the outlet pressure reaches a stable value.

In FIG. 3, the guide device 11 is fixed on the second diaphragm cap 312 and the valve body 2 as an independent part. Of course, the guide device 11 can also be integrally molded with the second diaphragm cap 312 but is not as an independent part, as shown in FIG. 8, which is a schematic diagram of another pressure regulating valve with a dual-hole internal pressure tapping structure having a pressure tapping pipe.

It is to be noted that the internal pressure tapping structure of the present disclosure can also be applied to pressure regulating valves with any structure, but is not limited to the pressure regulating valve with the structure as shown in FIG. 3. For example, as shown in FIG. 8, which is a schematic diagram of another pressure regulating valve with a dual-hole internal pressure tapping structure having a pressure tapping pipe, the pressure regulating valve has no lever but still adopts the dual-hole internal pressure tapping manner with the pressure tapping pipe. For the same parts in FIG. 8 and FIG. 3, the same numeral references are adopted and the description is not repetitively made hereby.

With respect to the shape of the pressure tapping passage, holes as shown in FIG. 3, FIG. 5 and FIG. 8 are cylindrical holes. Of course, the pressure tapping passages can also be rectangular holes or hole in other shapes. The number of the pressure tapping passage as shown in FIG. 3 is only one and the diameters of the upper and the lower portions are the same; the number of the pressure tapping passage as shown in FIG. 5 is two, wherein the diameters of the upper and lower portions of the pressure tapping passage connected with the pressure tapping pipe are the same and the diameter of the upper portion of the passage on the pressure inlet side is larger than the diameter of the lower portion thereof; and the number of the pressure tapping passage as shown in FIG. 8 is two, wherein the diameters of the upper and lower portions of each passage are the same, but the diameter of the passage on the pressure inlet side is smaller than the diameter of the passage on the pressure outlet side. It is to be noted that the influence of the same equivalence and difference of the diameters of the upper and lower portions of the pressure tapping passages on the performance of the pressure regulating valve in the flow accuracy range is not obvious; when the diameter of the passages is larger, the performance curve is enabled to be curved downwards; and the longer the pressure tapping pipes are, the more downwards the performance curve is curved.

As described above, the most important factor which influences the performance curve is whether the pressure tapping pipe on the pressure outlet side is arranged along the gas or liquid flow direction or not, and the arrangement of the positions of the pressure tapping passages does not greatly influence the performance curve.

Exemplary embodiments are provided to enable the present disclosure to be more complete and to comprehensively convey the protection range thereof to one skilled in the art. Many details, such as examples of specific parts, devices and methods are described to provide comprehensive understanding of the embodiments of the present disclosure. It is not necessary to provide details of which are obvious for one skilled in the art, and the exemplary embodiments can be implemented in many different ways and shall not be explained as limitations to the range of the present disclosure. In some exemplary embodiments, well-known processes, well-known device structures and well-known techniques are not described in details.

Although terms “first”, “second”, “third” and the like are used herein to describe various components, parts or portions, such components, parts or portions shall not be limited by such terms; and such terms can only be used for distinguishing a component, part or portion. When terms such as “first” and “second” and other numerical terms are used herein, it does not include sequence or order, unless otherwise clearly pointed in the context. Therefore, under the situation of not departing from the description of the exemplary embodiments, the first component, part or portion below can be explained as a term “first element, part or portion”.

Although various embodiments of the present invention have already been described herein in detail, it should be understood that the present invention is not limited to the embodiments described and illustrated herein and one skilled in the art can realize other transformations and variations under the situation of not departing from the essence and the range of the present invention. All such transformations and variations shall fall into the range of the present invention. In addition, all components described herein can be replaced by other technically equivalent components. 

1. A pressure regulating valve, comprising: an actuator and a valve body, communicating passages being arranged between a chamber of the valve body and a chamber of the actuator, characterized in that a pressure tapping pipe is further arranged in the chamber of the valve body, one end of the pressure tapping pipe is connected with the communicating passage and the other end of the pressure tapping pipe is suspended.
 2. The pressure regulating valve according to claim 1, characterized in that the number of the communicating passages is at least two, and the pressure tapping pipe is connected with at least one of the communicating passages.
 3. The pressure regulating valve according to claim 1 or 2, characterized in that the suspended end of the pressure tapping pipe is arranged in a direction along a gas or fluid flow direction.
 4. The pressure regulating valve according to claim 3, characterized in that the chamber of the valve body comprises a pressure inlet chamber and a pressure outlet chamber, and the pressure tapping pipe is arranged in the pressure outlet chamber.
 5. The pressure regulating valve according to claim 4, characterized in that the pressure regulating valve comprises: a valve rod and a valve seat, wherein the actuator is capable of pushing the valve seat to move in the pressure inlet chamber or the pressure outlet chamber through one end of the valve rod; and a guide device sleeved on the valve rod, wherein the guide device is arranged between the valve body and the actuator, and the communicating passages can be arranged on the guide device.
 6. The pressure regulating valve according to claim 5, characterized in that the communicating passages are distributed on two symmetrical sides of an axis of the valve rod.
 7. The pressure regulating valve according to claim 5, characterized in that the guide device can be integrally molded with the actuator.
 8. The pressure regulating valve according to claim 1, characterized in that the communicating passages are cylindrical holes. 